1 In Windows 10, the key combination WindowsKey+PrntScrn sends a png picture of your screen to your Screenshots folder. When this happens, the screen momentarily dims slightly to tell you that you are doing it. If your PrntScrn key has two jobs then you may need to press the Fn key as well -> Fn-WinKey-PrntScrn.
Wiktionary (5.00 / 10 votes) Rate this definition: petroleum (Noun). A flammable liquid ranging in color from clear to very dark brown and black, consisting mainly of hydrocarbons, occurring naturally in deposits under earth surface. Origin: From petroleum, from petra + oleum.
The name Petroleum covers both naturally occurring unprocessed crude oils and petroleum products that are made up of refined crude oil. A fossil fuel, it is formed when large quantities of dead organisms, usually zooplankton and algae, are buried underneath sedimentary rock and undergo intense heat and pressure.